Gillani Syed Tafheem Abbas, Hu Kui, Ali Babar, Malik Roshaan, Elhag Ahmed Babeker, Elhadi Khaled Mohamed
College of Civil Engineering, Henan University of Technology, Zhengzhou, 450001, China.
Henan Key Laboratory of Grain Storage Facility and Safety, Zhengzhou, 450001, China.
Environ Sci Pollut Res Int. 2023 Apr;30(17):50269-50279. doi: 10.1007/s11356-023-25905-w. Epub 2023 Feb 15.
The large consumption of natural resources by the construction industry and resultant pollution have inspired the necessity to investigate the potential of eco-friendly materials, such as recycled aggregates and recycled fibers. In this study, the effect of different percentages of recycled coarse aggregate (RCA) and nylon waste fibers (NWFs) was investigated on engineering performance and performance-related carbon emissions of high-performance concrete (HPC). Engineering performance indices include compressive strength (CS), splitting tensile strength (STS), water absorption (WA), and chloride ion penetration (CIP). The environmental impact of designed mixes was evaluated using a cradle-to-gate life cycle assessment approach on the HPC mixes. The results showed that the incorporation of 0.25-0.5% yielded maximum STS for all percentages of RCA. The use of NWF helped overcome the negative impact of RCA on the STS of HPC. The use of the 0.1-0.25% volume of NWF was beneficial to the permeability-related durability indicators of HPC. CS-related emissions were minimum for concrete mixes incorporating 0.1-0.25% NWF with 0% and 50% substitution levels of RCA. While STS-related emissions were lowest for HPC incorporating 0.5% NWF with 50% and 100% substitution levels of RCA.
建筑业对自然资源的大量消耗及其造成的污染激发了人们对研究环保材料潜力的必要性，比如再生骨料和再生纤维。在本研究中，研究了不同比例的再生粗骨料（RCA）和尼龙废纤维（NWFs）对高性能混凝土（HPC）工程性能及与性能相关的碳排放的影响。工程性能指标包括抗压强度（CS）、劈裂抗拉强度（STS）、吸水率（WA）和氯离子渗透性（CIP）。采用从摇篮到大门的生命周期评估方法对所设计的高性能混凝土混合料的环境影响进行了评估。结果表明，对于所有比例的再生粗骨料，掺入0.25 - 0.5%的尼龙废纤维可使劈裂抗拉强度达到最大值。尼龙废纤维的使用有助于克服再生粗骨料对高性能混凝土劈裂抗拉强度的负面影响。使用0.1 - 0.25%体积的尼龙废纤维有利于高性能混凝土与渗透性相关的耐久性指标。对于掺入0.1 - 0.25%尼龙废纤维且再生粗骨料替代水平为0%和50%的混凝土混合料，与抗压强度相关的排放最低。而对于掺入0.5%尼龙废纤维且再生粗骨料替代水平为50%和100%的高性能混凝土，与劈裂抗拉强度相关的排放最低。
